[1] He currently is the record-holder for the most caps for the Papua New Guinea national team, with 27, having made his senior international debut aged 17.
Foster was part of the Hekari United squad for the 2008–09 Papua New Guinea National Soccer League.
[10] He scored the only goal in the side's 1–0 semi-final victory over Welgris Highlanders, before the playoffs were called off and Hekari declared champions as the best regular season team.
[13] Hekari United went on to win the domestic title in the 2010–11 National Soccer League, beating Eastern Stars 4–0 in the Grand Final.
[23] With FC Port Moresby withdrawing from the 2014 National Soccer League, it looked like Foster would return to Eastern Stars, having trained with them early in January 2014,[24] but he eventually went to Admiralty,[25] another new franchise for the season.
[29] Ahead of the 2015–16 season, Foster moved to Rapatona,[30] with whom he had occasionally joined up with in the local Port Moresby Premier League during previous NSL off-seasons.
[35] Foster was also part of the side's 2016 OFC Champions League campaign, scoring in the club's 5–4 defeat to Solomon Warriors.
[38] The side finished in second place, with Foster playing 16 matches for the club and scoring a single goal, before returning to Malaita Kingz for the second half of the 2017–18 S-League season.
[42] However, Foster was able to pick up his fourth domestic title after Lae City defeated his former club Hekari United on penalties in the 2019 Grand Final.
[46] He played in all four of the country's fixtures, coming on as a substitute in all but one match: on 3 September 2011, he started and scored his second senior international goal in the 17–1 victory over Kiribati.
[47] He played in all four of the side's qualifiers for the 2018 FIFA World Cup, and all but one of the country's five fixtures at the 2019 Pacific Games.